Pre-Tracking

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Technical Details

• Variable Type: Discrete Metric
• Data Type: Boolean
• Units: True/False
• Column Name: pre_tracking_flag
• Aggregation: rate
• Precision: 0
• Optimal Direction: Lower is better
• Unknown Value: -1
• Measurement: Trunk and pelvis rotation away from the target between initiation and drive start
• Threshold: Trunk or pelvis rotates more than 40° away from the target

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Description

Pre-tracking is a binary indicator that flags when the shoulders and/or hips rotate away from the target by more than 40° before the drive phase begins, which can indicate the pitcher is opening up too early in the delivery.

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Use Cases

• Trunk and pelvis sequencing assessment
• Mechanics evaluation

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Corrective Drills

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1. Target-Facing Windup Drill

Stand facing the target (catcher) with feet together. Perform slow-motion windups while keeping the shoulders and hips square to the target through the initiation phase, only allowing rotation to begin at the drive step. Use a mirror or video to confirm the trunk and pelvis stay facing forward. Perform 3 sets of 10 slow repetitions. Search YouTube: softball pitching windup drill stay closed

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2. Wall Drill for Hip/Shoulder Alignment

Stand with the back foot against a wall, facing the target. Work through the windup and leg lift while keeping the hips and shoulders aligned with the target line. The wall provides a tactile reference to prevent premature rotation. Perform 20 repetitions before bullpen sessions. Search YouTube: softball pitching wall drill hip shoulder alignment